"Why Don't the English Speak Welsh?" Hildegard Tristram, chapter 15 in The Britons in Anglo-Saxon England, N. J. Higham (ed.), The Boydell Press 2007 ISBN1843833123, pp. 192–214. [1]Diarsipkan 2011-07-19 di Wayback Machine.
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"Why Don't the English Speak Welsh?" Hildegard Tristram, chapter 15 in The Britons in Anglo-Saxon England, N. J. Higham (ed.), The Boydell Press 2007 ISBN1843833123, pp. 192–214. [1]Diarsipkan 2011-07-19 di Wayback Machine.